Apparatus for landing pipe

ABSTRACT

Apparatus for landing pipe stands during the pulling of a drill string from bore holes, such apparatus comprising a prime mover connected through a kinematic chain to a drive shaft having a drive gear keyed thereto and adapted to be mounted on the monkey board of an oil well derrick. Also adapted to be mounted on the monkey board in proximity to the drive shaft with the gear keyed thereto is a winch assembly which is pivotally mounted for oscillatory movement about a horizontal axis. The winch assembly includes a winch drum which is keyed to a shaft which is rotatably journaled and carries at one end, a gear which is aligned, and adapted to mate, with the drive gear carried by the drive shaft. A cable rope is deadended to the winch. A pivoted stop arm assembly may be used to retain the winch assembly in a position in which the driven gear is in meshing engagement with the drive gear on the drive shaft, and also functions in part as a stop against which the winch assembly rests when it is pivoted to a position of non-engagement with the gear on the drive shaft.

iinited States Patent [1 1 Boyd [451 Apr. 3, W73

[54] APPARATUS FOR LANDING PIPE [76] Inventor: Donald R. Boyd, P. O. Box141,

Texola, Okla. 73668 [22] Filed: Oct. 11, 1970 [21] Appl. No.: 77,127

[52] US. Cl. ..2l4/2.5, 242/85, 254/186 [51] Int. Cl. ..E2lb 19/14 [58]Field of Search....2l4/2.5; 254/150, 186 R, '187,

l [56] References Cited UNITED STATES PATENTS Hembree .....2l4/2.5

[57] ABSTRACT Apparatus for landing pipe stands during the pulling of adrill string from bore holes, such apparatus comprising a prime moverconnected through a kinematic chain to a drive shaft having a drive gearkeyed thereto and adapted to be mounted on the monkey board of an oilwell derrick. Also adapted to be mounted on the monkey board inproximity to the drive shaft with the gear keyed thereto is a winchassembly which is pivotally mounted for oscillatory movement about ahorizontal axis. The winch as sembly includes a winch drum which iskeyed to a shaft which is rotatably journaled and carries at one end, agear which is aligned, and adapted to mate, with the drive gear carriedby the drive shaft. A cable rope is deadended to the winch. A pivotedstop arm assembly may be used to retain the winch assembly in a positionin which the driven gear is in meshing engagement with the drive gear onthe drive shaft, and also functions in part as a stop against which thewinch assembly rests when it is pivoted to a position of non-engagementwith the gear on the drive shaft.

' 13 Claims, 4 Drawing Figures FIELD OF THE INVENTION This inventionrelates to oil well drilling rig components, and more particularly, to apowered winch structure particularly adapted for landing stands of drillpipe removed from an oil well bore hole during the making of a trip forthe purpose of replacing the bit, and similar operations.

BRIEF DESCRIPTION OF THE PRIOR ART cable used to withdraw the drillstring from the hole.

Tongs are clamped to the upper end of the drill string and the tongs andattached drill string are then pulled upwardly toward a standing blockover which the cables are extended and which is located at the top ofthe derrick.

Generally from two to four interconnected joints of drill pipe will bepulled upwardly at one tine from the hole so that the upper end of theuppermost joint is near the top of the derrick. In this position, theupper end of the stand of pipe extends through an opening in a monkeyboard, which is a horizontal platform located near the top of thederrick. A roughneck standing on the monkey board then assists anotherone of the crew, who stands adjacent the rotary table, in landing andstoring the stands of drill pipe. This entails disconnecting the lowerend of the stand from the uppermost joint of pipe still in the hole, andthen moving the stand of pipe to one side so that it rests upon the rigfloor at its lower end, and leans against,'and is supported by, a fingerat a point spaced downwardly from its upper end. The landing of thestands of drill pipe is carried 3 out by the roughneck standing on themonkey board by wrapping a rope or cable around the upper end portion ofthe stand of pipe several times, and then pulling the pipe to one sideto swing it into the storage position in which it leans against thefingers to form what is termed the setback.

l-leretofore, considerable manual effort, and some danger to theroughneck, has been involved in manipulating the stand of drill pipe bythe use of the length of rope employed by the roughneck. The standsconstituting from two to four joints of pipe are heavy, and the guidancewhich must be applied to the stands to see that they are properlystacked in the setback requires care and strength on the part of theperson accomplishing the landing. Moreover, the upper end portion of thestand must be moved further from its vertical alignment with the drillstring than must the lower end of the stand in bringing the stand to theproper position in the setback.

BRIEF DESCRIPTION OF THE PRESENT INVENTION The present inventioncomprises apparatus for assisting a roughneck standing upon a monkeyboard in a derrick of a drilling rig in landing stands of pipe in asetback during the making of a trip to pull the drill string from a borehole. The apparatus may also be used for removing the stands of drillpipe from the setback for purposes of re-running the string into thebore hole.

Broadly described, the apparatus of the invention comprises a primemover, which may be gasoline powered, but which is preferably anelectric motor, mounted in any suitable fashion on the monkey board ofthe derrick of a drilling rig and driving, through suitable reductiongearing, an output drive shaft which has keyed thereto a drive gear.Positioned adjacent the driving assembly as thus described is a winch ordrum which is keyed to a shaft joumaled in suitable journal blocks orbearings at the upper end of a pair of vertical standards which aresupported for pivotal movement about a horizontal axis. With thisarrangement, the winch drum and the shaft to which it is keyed may bepivoted through an are about a horizontal axis.

The shaft to which the winch drum is secured has keyed to one endthereof a gear which is adapted to mesh with the drive gear keyed to thedrive shaft. By pivotation of the winch assembly to one position, suchdriving engagement between the described gears may be effected so thatthe winch is positively driven in rotation. A rope or cable isdead-ended to the winch drum, and may be reeled upon this drum when thegears are meshed in the manner described. When the winch assembly ispermitted to pivot to a position in which the described gears are out ofengagement, the drum is then free wheeling in the sense that no drive isimparted to the shaft to which it is keyed. The rope may then be pulledfreely out from the winch drum so that it may be looped around the upperend portion of a stand of drill pipe preparatory to landing the pipe bythe aid of the winch drum when powered. A stop arm is provided adjacentthe winch assembly to maintain this assembly in an upright position inwhich the gears are engaged at such times as this may be desirable, anda portion of the stop arm also functions to arrest the downward pivotalmovement of the winch assembly at times when the gear thereof is not inengagement with the drive gear.

An object of the present invenn'on is to provide a powered apparatuswhich may be used by a drilling crew to enhance the ease with whichstands of drill pipe may be landed during a trip for the purpose ofreplacing the drill bit.

A further object of the invention is to improve the safety with which aroughneck may perform one of the main functions assigned him during theretrieval of drill pipe from a well bore during the replacement of thebit Additional objects and advantages of the invention will becomeapparent as the following detailed description of the invention is readin conjunction with the accompanyin g drawings which illustrate theinvention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevation view of thepipe landing apparatus of the invention.

FIG. 2 is a plan view of the apparatus depicted in FIG. 1.

FIG. 3 is a view in elevation from another side of the apparatus fromthat appearing in FIG. 1.

FIG. 4 is a schematic elevational view illustrating the apparatus of theinvention as it is used in a drilling rig for drilling well bores.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTIONReferring to FIG. 1 of the drawings, shown therein is a supportingstructure upon which the operating portions of the apparatus of thepresent invention are located. This supporting structure 10 is in thenature of a platform which can be rested on the monkey board of adrilling rig, or may be mounted on some portion of the derrick. To theend of permitting the supporting structure 10 to be mounted on one ofthe cross members 11 of the derrick, a pair of supporting runners 12 aremounted on the under side of the supporting structure, and have arcuaterecesses 14 formed in the center of the lower side thereof foraccommodating a cross member upon which the support structure is to bemounted. U-bolts 15 are extended through the support-' ing runners 12and around the cross member 11 and, when tightened, hold the supportingstructure 10 in a substantially horizontal position. The location atwhich the supporting structure 10 is mounted upon the monkey board orderrick in relation to the pipe which is to be landed will be hereafterdiscussed.

Secured by any suitable means to the upper side of the supportingstructure 10 is a reduction gear housing 16 which, in the illustratedembodiment thereof, has an electric motor 18 mounted thereon. Theelectric motor 18 constitutes a prime mover for operating the pipelanding apparatus of the invention, and is supported on the reductiongear housing 16 by means of a suitable supporting bracket assembly 20.With the illustrated arrangement, the electric motor 18 drives a pulley22 keyed to an output shaft 24, and the pulley 22 in turn drivinglyengages a drive belt 26 which turns a pulley 28 keyed to an input shaft30 extending into the reduction gear housing 16. Reduction gearinglocated in the housing 16 effects a reduction of the speed of rotationof the input shaft 30 so that an output shaft 32 from the reductiongearing is turned at a slower rate. The output shaft 32 has keyedthereto a gear 34 which will hereafter be referred to as a drive gear.The output shaft 32 is also hereinafter referred to as a drive shaft.

Mounted on the supporting structure 10 adjacent the reduction gearhousing 16 is a winch assembly designated generally by reference numeral40. The winch assembly includes a pair of vertical stanchions or uprightmembers 42 which have secured to their upper ends, a base plate 44, anda journal block plate 46. Each of the journal block plates 46 carries ajournal block 48 which journals a winch shaft 50. Keyed to the winchshaft 50 between the vertical standards 42 is a winch drum 52 havingretainer flanges 54 disposed at opposite ends thereof. It will be notedthat the winch shaft 50 projects through one of the journal blocks 48nearest the reduction gear housing 16 and carries upon this end of thewinch shaft, a driven gear 56 (see FIGS. 2 and 3). The teeth of thedriven gear 56 are arranged to mesh with the teeth of the drive gear 34when the gears are brought into mating engagement as hereinafterexplained.

The vertical stanchions 42 extend through horizontal slots 58 fon'ned inthe supporting structure 10, and are secured at their lower ends to apivot shaft 60 which has its opposite ends extended through journalblocks 62 mounted on the lower side of the supporting structure 10. Withthis arrangement, the upright stanchions 42 can be pivoted about ahorizontal axis of pivotation extending coincidentally with thelongitudinal axis of the shaft 60 so that the winch shaft 50 and thewinch drum 52 which it carries are moved through an are from the fullline position to the dashed line position depicted in FIG. 3.

It will be noted that in the full line position illustrated in FIG. 3,the driven gear 56 carried upon the outer end of the winch shaft 50 isin meshing engagement with the drive gear 34 so that the winch shaft andthe winch drum 52 which it carries are driven in rotation. The directionof rotation at this time is such that a rope, cable or other flexiblemember which is deadended upon, or secured to, the winch drum 52 iswound upon this drum. At a time when the winch assembly 40 is pivoted tobring the winch shaft 50 and the drum keyed thereto to the dashed lineposition shown in FIG. 3, the driven gear 56 is disengaged from thedrive gear 34, and the winch drum 52 becomes free wheeling. At thistime, a flexible member 66 secured to the winch drum 52 may be easilypaid out from the drum.

For the purpose of providing a positive stop limiting movement of thewinch assembly 40 in a direction which brings the driven gear 56 intoengagement with the drive gear 34, a pair of arresting plates 68 aresecured to the upper side of the supporting structure 10 in alignmentwith the vertical stanchions 42. Thus, the pivotal movement of the winchassembly 40 is limited by the arresting plates 68 to prevent anundesirably forcible contact between the driven gear 56 and the drivegear 34. Pivotation of the winch assembly 40 in the opposite directionis limited by a stop arm assembly designated generally by referencenumeral 69.

The stop arm assembly 69 includes a crank arm 70 having a handle portion70a and an arresting portion 70b. An intermediate portion 70 of thecrank arm 70 extends through a journal block 72 mounted on the upperside of the supporting structure 10. The crank arm 70 has the arrestingportion 70b offset or angled with respect to the portion carrying thehandle 70a so that when the handle is pivoted downwardly into contactwith the supporting structure 10, the arresting portion 70b of the crankarm projects upwardly in the manner illustrated in FIG. 3. In thisposition, the arresting portion 70b of the crank arm 70 provides a stoplimiting the downward pivotal movement of the winch assembly 40 at alocation such that the winch drum 52 may rotate freely with the shaft 50without the flanges 54 contacting the supporting structure 10. When thewinch assembly 40 is pivoted to its upwardly extending drive position,in which the driven gear 56 meshes with the drive gear 34, the stop armassembly 69 may be pivoted from a position illustrated in full lines inFIG. 3 to a position in which the arresting portion 70b of the crank arm70 engages one side of one of the vertical standards 42, and preventsthe winch assembly 40 from pivoting out of engagement with the drivegear 34.

In FIG. 4 of the drawings, the location of the pipe landing apparatus ofthe invention in the drilling rig is illustrated. The drilling rigincludes, of course, a derrick 80 which is centered over a bore hole 82in which a drill string is located. Centered in the floor 84 of the rigis a rotary table 86 used for rotating the drill string, and formanipulating (connecting and disconnecting, etc.) drill pipe as it isrun into the bore hole for the purpose of extending the drill into theearth, and also for removing the drill string for bit replacement. Inremoving the drill string for bit replacement or repair, one member 88of the drilling crew stands on a monkey board 90 located near the top ofthe derrick 80, and another crew member 92 stands near the rotary table86 on the rig floor 84. The upper end of the drill string is engaged bya pair of tongs 94 suspended by cables from a'crown block in the top ofthe derrick and the drill pipe is retrieved from the well bore bypulling upwardly on the tongs.

As drill pipe is removed from the bore hole 82, it is disconnected instands consisting of from two to four joints of drill pipe, with theconnection being broken by the crew member 92 at the rotary table 86.After disconnection of adjacent joints of pipe at this location, thestand is then moved to one side by the crew members 88 and 92, andplaced in what is termed a setback. The pipe stands in the setback restupon a finger structure 98 secured to the derrick. The crew member 88standing on the monkey board 90 accomplishes the translational movementof the pipe from its position upon pulling from the well bore to thesetback by throwing a rope or other flexible member around the upperportion of the stand, and then manhandling it to the position of storagein the setback. The crew member 92 located on the rig floor also mustpush the lower end of the pipe slightly to one side, and away from therotary table in placing the stand in the setback. It is apparent,however, that the displacement of the lower end of the pipe from theposition of disconnection of the stand from the remainder of the drillstrong is not so great as in the case of displacement of the upperportion of the pipe. Moreover, with the upper portion of the pipe standbeing closer to the point of connection thereto of the tongs 94, agreater effort and larger force is required to displace this upperportion of the pipe to its position of storage in the setback.

While the previous methods of pulling stands of drill pipe and placingthem in the setback have entailed purely manual effort on the part ofthe crew member 88 standing on the monkey board 90, the presentinvention permits this operation to be carried out more expeditiously,more easily, and with greater safety by using the power developed by thepipe line landing apparatus of the invention to supplant the manualeffort previously required. The pipe landing apparatus of the inventionis schematically illustrated in FIG. 4 of the drawings to show itslocation in relation to the setback and the stand of pipe uponwithdrawal from the well bore, and is here designated generally byreference numeral 100.

OPERATION In utilizing the pipe landing apparatus of the invention, therig crewman 88 standing on the monkey board works with the free end ofthe rope 66 or other flexible member which is connected to the winchdrum 52. As the drill string is pulled so that a stand extends betweenthe crewman 88 and the crewman 92, the crewman 88 takes several wrapsaround the upper end portion of the stand with the rope. At this time,the winch assembly 40 is in the inclined position in which the drivengear 56 is out of engagement with the drive gear 34. The winch drum 52is thus free wheeling, and the crewman 88 on the monkey board may thusmanipulate the rope freely.

In taking the wraps around the upper end portion of I the stand of drillpipe, the crewman pulls the rope taut so as to tension the rope andpivot the winch assembly 40 upwardly to the point where the driven gear56 engages the drive gear 34. The winch drum 52 then commences to turnin a direction such that the rope is wound upon the drum. With the pipelanding apparatus positioned in the general direction of the pipesetback in which the pipe stands are to be stored, taking in the ropewill have the effect of drawing the pipe stand, which has now beendisconnected by the crewman 92 from the remainder of the drill string,toward the setback. The crewman 88 on the monkey board 90 thereforeneeds only to guide the pipe stand as it is pulled toward the setback bythe winch drum 52. When the pipe stand has been pulled to the locationof the set back, and lowered away slightly so as to rest the lower endof the stand on the rig floor 84, the crewman 88 may then slack the ropethrough the turns around the upper end portion of the stand so that thetension is removed from the rope, and the winch assembly 40 is allowedto pivot to its disengaged position. The winch drum 52 then becomes freewheeling, and the rope may be easily disengaged from the drill pipe andcarried back by the crewman 88 to a position preparatory to taking wrapsaround the next stand of pipe as it is pulled upwardly by the tongs 94.

Although a preferred embodiment of the invention has been hereindescribed and is illustrated in the drawings, it is to be understoodthat various changes and innovations in the depicted and describedstructure can be effected without departure from the basic principles ofthe invention. Changes and innovations of this type are therefore deemedto be circumscribed by the spirit and scope of the invention except asthesame may be necessarily limited by the appended claims or reasonableequivalents thereof.

What is claimed is: 1. Apparatus for landing drill pipe comprising: aprime mover; a shaft drivingly connected to said prime mover; a drivegear keyed to said shaft; and a winch assembly positioned adjacent saidshaft and drive gear, and comprising: a a supporting structure;

means pivotally mounted on said supporting structure for pivotationabout a horizontal axis and rotatably journaling a winch shaft spacedfrom said supporting structure and extending substantially parallel tosaid horizontal axis;

a winch drum keyed to said winch shaft for rotation therewith;

a driven gear keyed to said winch shaft for rotation therewith andaligned with said drive gear for meshing engagement with said drive gearwhen said means mounted on said supporting structure is pivoted aboutsaid horizontal axis to a first position, and for a disengagement fromsaid drive gear when said means mounted on said supporting structure ispivoted to a second position; and

an elongated flexible member having a free end and having a second endconnected to said winch drum for pulling said winch drum and pivotallymounted means to a position in which said driven gear meshingly engagessaid drive gear, said flexible member being free and unengaged betweenthe one end thereof connected to said winch drum and the free endthereof whereby said elongated flexible member may be tensioned manuallyby a workman, and may be directionally extended by a workman.

2. Apparatus as defined in claim 1 and further characterized asincluding reduction gearing connected between said prime mover and saidfirst-mentioned shaft.

3. Apparatus as defined in claim 2 wherein said prime mover, reductiongearing and first-mentioned shaft are mounted on said supportingstructure.

4. Apparatus as defined in claim 1 and further characterized asincluding a stop arm assembly pivotally mounted on said supportingstructure and pivotable to a position in engagement with said meansjournaling said winch shaft when said means journaling said winch shaftis in said first position.

5. Apparatus as defined in claim 4 wherein said stop arm assemblycomprises:

a crank arm having a handle portion;

an arresting portion aligned with said means pivotally mounted on saidsupporting structure for arresting pivotal movement thereof from saidfirst position when said handle portion is pivoted upwardly; and

an intermediate portion interconnecting said handle portion andarresting portion.

6. Apparatus as defined in claim 4 wherein said means pivotally mountedon said supporting structure comprises:

a pair of horizontally spaced vertical stanchions each rotatablysupporting said winch shaft at the upper end thereof, and each having alower end;

a horizontally extending pivot shaft secured to the lower ends of saidvertical stanchions; and

journal blocks mounted on said supporting structure and pivotallyreceiving said pivot shaft.

7. Apparatus as defined in claim 6 wherein said stop arm assemblycomprises:

a crank arm having a handle portion;

an arresting portion aligned with said means pivotally mounted on saidsupporting structure for arresting pivotal movement thereof from saidfirst position when said handle portion is pivoted upwardly; and

an intermediate portion interconnecting said handle portion andarresting portion.

8. Apparatus as defined in claim 1 wherein said means pivotally mountedon said supporting structure comprises:

a pair of horizontally spaced vertical stanchions each rotatablysupporting said winch shaft at the upper end thereof, and each having alower end;

a horizontally extending pivot shaft secured to the lower ends of saidvertical stanchions; and

journal blocks mounted on said supporting structure and pivotallyreceiving said pivot shaft.

9. Apparatus as defined in claim 1 and further characterized asincluding an arresting plate secured to said supporting structure andarresting movement of said means pivotally mounted on said supportingstructure as said pivotally mounted means moves from said secondposition to said first position.

10. Apparatus as defined in claim 1 wherein said supporting structurecomprises:

a vertically extending derrick;

a monkey board mounted in said derrick near the upper end thereof andprojecting horizontally, said monkey board having said pivotally mountedmeans supported on the upper side thereof whereby a workman standing onsaid monkey board may manually manipulate said elongated flexiblemember.

11. Apparatus for pulling and landing drill pipe stands comprising, incombination:

a derrick;

a monkey board mounted in the derrick near the upper end thereof;

means mounted on the derrick for pulling drill pipe from a bore holeupwardly in the derrick to above the level of the monkey board; and

pipe landing apparatus mounted in the derrick at the level of the monkeyboard and comprising:

a driving gear;

means for driving the driving gear in rotation;

a winch drum;

means drivingly connected to the winch drum for driving the winch drumin rotation, and detachably engageable with said driving gear forreceiving rotary motion therefrom;

means for pivoting the winch drum and the means drivingly connectedthereto between driven and disengaged positions in which said meansdrivingly connected to the winch drum engages said driven gear and isdisengaged therefrom, respectively; and

an elongated flexible member connected to said winch drum for reelingthereupon.

12. Apparatus as defined in claim 11 wherein said winch drum and themeans drivingly connected thereto are mounted by pivotation by gravityto said disengaged position.

13. Apparatus as defined in claim 12 and further characterized asincluding stop arm means for preventing pivotation of said winch drumfrom said driven position to said disengaged position.

1. Apparatus for landing drill pipe comprising: a prime mover; a shaftdrivingly connected to said prime mover; a drive gear keyed to saidshaft; and a winch assembly positioned adjacent said shaft and drivegear, and comprising: a supporting structure; means pivotally mounted onsaid supporting structure for pivotation about a horizontal axis androtatably journaling a winch shaft spaced from said supporting structureand extending substantially parallel to said horizontal axis; a winchdrum keyed to said winch shaft for rotation therewith; a driven gearkeyed to said winch shaft for rotation therewith and aligned with saiddrive gear for meshing engagement with said drive gear when said meansmounted on said supporting structure is pivoted about said horizontalaxis to a first position, and for a disengagement from said drive gearwhen said means mounted on said supporting structure is pivoted to asecond position; and an elongated flexible member having a free end andhaving a second end connected to said winch drum for pulling said winchdrum and pivotally mounted means to a position in which said driven gearmeshingly engages said drive gear, said flexible member being free andunengaged between the one end thereof connected to said winch drum andthe free end thereof whereby said elongated flexible member may betensioned manually by a workman, and may be directionally extended by aworkman.
 2. Apparatus as defined in claim 1 and further characterized asincluding reduction gearing connected between said prime mover and saidfirst-mentioned shaft.
 3. Apparatus as defined in claim 2 wherein saidprime mover, reduction gearing and first-mentioned shaft are mounted onsaid supporting structure.
 4. Apparatus as defined in claim 1 andfurther characterized as including a stop arm assembly pivotally mountedon said supporting structure and pivotable to a position in engagementwith said means journaling said winch shaft when said means journalingsaid winch shaft is in said first position.
 5. Apparatus as defined inclaim 4 wherein said stop arm assembly comprises: a crank arm having ahandle portion; an arresting portion aligned with said means pivotallymounted on said supporting structure for arresting pivotal movementthereof from said first position when said handle portion is pivotedupwardly; and an intermediate portion interconnecting said handleportion and arresting portion.
 6. Apparatus as defined in claim 4wherein said means pivotally mounted on said supporting structurecomprises: a pair of horizontally spaced vertical stanchions eachrotatably supporting said winch shaft at the upper end thereof, and eachhaving a lower end; a horizontally extending pivot shaft secured to thelower ends of said vertical stanchions; and journal blocks mounted onsaid supporting structure and pivotally receiving said pivot shaft. 7.Apparatus as defined in claim 6 wherein said stop arm assemblycomprises: a crank arm having a handle portion; an arresting portionaligned with said means pivotally mounted on said supporting structurefor arresting pivotal movement thereof from said first position whensaid handle portion is pivoted upwardly; and an intermediate portioninterconnecting said handle portion and arresting portion.
 8. Apparatusas defined in claim 1 wherein said means pivotally mounted on saidsupporting structure comprises: a pair of horizontally spaced verticalstanchions each rotatably supporting said winch shaft at the upper endthereof, and each having a lower end; a horizontally extending pivotshaft secured to the lower ends of said vertical stanchions; and journalblocks mounted on said supporting structure and pivotally receiving saidpivot shaft.
 9. Apparatus as defined in claim 1 and furthercharacterized as including an arresting plate secured to said supportingstructure and arresting movement of said means pivotally mounted on saidsupporting structure as said pivotally mounted means moves from saidsecond position to said first position.
 10. Apparatus as defined inclaim 1 wherein said supporting structure comprises: a verticallyextending derrick; a monkey board mounted in said derrick near the upperend thereof and projecting horizontally, said monkey board having saidpivotally mounted means supported on the upper side thereof whereby aworkman standing on said monkey board may manually manipulate saidelongated flexible member.
 11. Apparatus for pulling and landing drillpipe stands comprising, in combination: a derrick; a monkey boardmounted in the derrick near the upper end thereof; means mounted on thederrick for pulling drill pipe from a bore hole upwardly in the derrickto above the level of the monkey board; and pipe landing apparatusmounted in the derrick at the level of the monkey board and comprising:a driving gear; means for driving the driving gear in rotation; a winchdrum; means drivingly connected to the winch drum for driving the winchdrum in rotation, and detachably engageable with said driving gear forreceiving rotary motion therefrom; means for pivoting the winch drum andthe means drivingly connected thereto between driven and disengagedpositions in which said means drivingly connected to the winch drumengages said driven gear and is disengaged therefrom, respectively; andan elongated flexible member connected to said winch drum for reelingthereupon.
 12. Apparatus as defined in claim 11 wherein said winch drumand the means drivingly connected thereto are mounted by pivotation bygravity to said disengaged position.
 13. Apparatus as defined in claim12 and further characterized as including stop arm means for preventingpivotation of said winch drum from said driven position to saiddisengaged position.